Single Independent Riser: A Cost Efficient Ultra-Deep Water Riser

F. Lirola, Eric Revault, J. Lunven
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Abstract

Hydrocarbon fields discovered in ever deeper waters and uncertainties regarding oil prices are driving the need for cost efficient riser concepts tailored for ultra-deep waters. The Single Independent Riser (SIR) is an innovative hybrid riser configuration optimized for Ultra-Deep water field development. This paper will provide a general overview of the SIR with a specific focus on its installation method and the associated tools that were developed. The SIR is based on a hybrid solution composed, from bottom-up, of a rigid part vertically tensioned by means of distributed or continuous buoyancy and a flexible jumper. This configuration features improved dynamic behavior for the rigid riser section under fatigue and extreme environmental conditions thanks to its compliant shape. The configuration of the flexible jumper ensures displacements of the rigid riser section are significantly decreased compared to that of an SHR. In addition, its design makes it adapted to any water depth beyond 1000 m. The SIR is also inherently safer as it is less sensitive to buoyancy loss than a riser tensioned by mean of a buoyancy tank. This design is highly versatile and can easily be staggered to comply with design constraints, congested lay out and installation scheme. The relevancy of the SIR has been assessed on the basis of several case studies derived from actual projects as well as on-coming prospects. The considered cases include a wide range of environments such as West of Africa, East of Africa, Brazil and riser types, both for pipe in pipe and single pipe arrangements, in order to confirm the suitability of the design. Extreme, wave fatigue, VIV fatigue, interference analyses were conducted through these assessments. In parallel, a dedicated installation method was developed to address the specificities of the design and to cover both dry and wet flexible jumper connections. In the frame of this study, specific installation tools were designed to reduce the need for offshore assets during installation. This paper will first provide a general overview of the SIR, illustrating the arrangement of the various components and providing outcomes of engineering studies confirming the relevancy of the design. A second part will focus on its installation method and the associated tools that were developed.
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单独立立管:一种经济高效的超深水立管
在更深的水域发现了油气油田,以及油价的不确定性,推动了对针对超深水定制的低成本立管概念的需求。单独立立管(SIR)是一种创新的混合立管配置,针对超深水油田开发进行了优化。本文将提供SIR的总体概述,并特别关注其安装方法和开发的相关工具。SIR基于一种混合解决方案,由自下而上的刚性部分组成,通过分布式或连续浮力和柔性跳线垂直拉伸。由于其柔性形状,这种结构在疲劳和极端环境条件下改善了刚性立管部分的动态性能。与SHR相比,柔性跳线的配置确保刚性隔水管部分的位移显著减少。此外,它的设计使其适应超过1000米的任何水深。SIR本身也更安全,因为它对浮力损失的敏感性低于通过浮力罐张拉的立管。这种设计具有很强的通用性,可以很容易地错开,以符合设计约束,拥挤的布局和安装方案。根据从实际项目和即将到来的前景中得出的几个案例研究,评估了可持续发展评估的相关性。考虑的情况包括西非、东非、巴西和立管类型等各种环境,包括管中管和单管布置,以确认设计的适用性。通过这些评估进行了极端、波疲劳、VIV疲劳、干扰分析。同时,开发了一种专用的安装方法来解决设计的特殊性,并涵盖干式和湿式柔性跳线连接。在本研究的框架内,设计了特定的安装工具,以减少安装过程中对海上资产的需求。本文将首先提供SIR的总体概述,说明各种组件的安排,并提供确认设计相关性的工程研究结果。第二部分将重点介绍其安装方法和开发的相关工具。
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